Abstract: Ending effect is produced in the decomposition process of empirical mode decomposition(EMD) based Hilbert-Huang transformation.It leads to distortion near the two end points of the signal processed.Several methods of restraint aimed at ending effect are proposed.Comparison has been made among the global average statistic method,the parallel line extending method,the polynomial curvefitting method,the mirror extending method and the neural networks extending method.As a result of simulation and experiment,it is shown that ending effect can be effectively restrained.